Which of the following produces the secondary tissues of trees?

a. Sapwood
b. Cork
c. Vascular cambium
d. Heartwood
e. Cortex


Ans: c. Vascular cambium

Biology & Microbiology

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A tubal ligation consists of cutting and sealing the vas deferens so that sperm are unable to reach the seminal fluid.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Recent data indicate what regarding forests in eastern North America?

A) a steady increase in forest since the late 1800s B) no change over the past 200 years C) no change in the past 50 years D) a decline in forested area in the past 50 years

Biology & Microbiology

Which of the following is a non-protein carrier found in some electron transport chains?

A) flavoproteins B) metal-containing proteins C) ribozymes D) cytochromes E) ubiquinones

Biology & Microbiology

One difference between DNA and RNA is that __________.

A. DNA is single-stranded, whereas RNA is double-stranded. B. DNA uses ribose, whereas RNA uses deoxyribose. C. DNA uses the bases CGAT, whereas RNA uses the bases CGAU. D. DNA is a nucleic acid, and RNA is a protein.

Biology & Microbiology